JPS60868B2 - Power transmission device for toy vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission device for toy wheels, and more particularly to a power transmission device for an all-wheel drive type toy axle.

Generally, in an automobile, the resistance torque applied to each wheel is not the same, and the diameter of each wheel steel is not necessarily the same, so it is impossible to keep the circumferential speed of each axle strictly constant.

Therefore, in the case of an all-wheel drive vehicle, if all wheels are driven at high speed, the front wheels or rear wheels (in the case of a four-wheel drive vehicle) will slip, which will not only reduce high-speed performance but also be dangerous. At high speeds, only one axis is driven and the other axes are often left as slave axes. This situation is the same for toy cars, and when producing an all-wheel drive toy car, the power transmission device must be configured so that it can be switched to Ito drive when driving at high speeds. desirable. An object of the present invention is to provide an all-wheel drive type power transmission system for a steel toy car that can automatically switch to uniaxial drive during high-speed running.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figures 1 and 2 show an embodiment of the present invention in a two-axle all-wheel drive toy car.
is the front axle, 2 is the rear axle, 3 is the front wheel, and 4 is the rear wheel.

Further, a first driven sprocket 5 and a slip clutch (hereinafter simply referred to as a clutch) 6 are attached to the front axle 1, and a second driven sprocket 7 is attached to the rear axle 2. The numbers of teeth of the first and second driven sprockets 5 and 7 are different from each other. A driving shaft 8 is provided between the front axle 1 and the rear axle 2, and the same number of driving sprockets 9 as the driven sprockets 5 and 7 are attached to the driving shaft 8. Each driving sprocket 9 has the same number of teeth, and chains 10 and 11 are individually connected between each driving sprocket 9 and each driven sprocket 5 and 7, respectively. The clutch 6 may be of any type, such as a centrifugal clutch, a conical clutch, or a regular disc clutch, but it is engaged only when the resistance torque applied to the front axle 1 is 50% or more of the drive torque. It is configured to be disengaged when the torque becomes 50% or less of the drive torque (that is, when a light load and high speed state is reached). In the power transmission device of the present invention having the structure as described above, each of the driving sprockets 5 and 7 is adjusted in consideration of the difference between the resistance torque applied to the front axle 1) and the resistance torque applied to the rear axle 2). Because the number of teeth is different, the circumferential speed and driving force of the front wheel 3 and rear wheel 4 can be made different, and therefore,
When driving off-road, the front wheels 3 and rear wheels 4 work together to provide tenacious driving power, but on the other hand, when driving at high speeds on flat roads, the clutch 6 automatically disengages and the clutch 6 is automatically disengaged. Since it is driven, stable high-speed running can be achieved. In the embodiment, a clutch is provided on the front axle, but a clutch may be provided on the rear axle and no clutch may be provided on the front axle.

[Brief explanation of drawings]

Fig. 1 is a side view of the power transmission device of the present invention, and Fig. 2 is a side view of the power transmission device of the present invention.
FIG. 1: Front axle, 2: Rear axle, 3: Front wheel, 4: Rear wheel, 5: First driven sprocket 6: Clutch 7
;Second driven sprocket 8: Driving shaft, 9: Drive sprocket, 10, Chain chain. Fig. 1 Fig. 2

Claims (1)

[Claims] 1. A power transmission device for a toy vehicle having at least two or more axles, comprising a first driven sprocket and a clutch attached to each axle except for one specific axle among the axles; a second driven sprocket having a different number of teeth or a different diameter from the first driven sprocket attached to the specific axle, and a transmission means attached to the driving shaft for driving at least one of the axles; an endless chain wound directly or indirectly between the first and second driven sprockets, an axle provided with the first driven sprocket, and an axle provided with the second driven sprocket. A power transmission device for a toy vehicle, characterized in that the axles rotate at different speeds.